Critical severity9.1NVD Advisory· Published Apr 9, 2026· Updated Apr 22, 2026
CVE-2026-34177
CVE-2026-34177
Description
Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/canonical/lxdGo | >= 0.0.0-20210305023314-538ac3df036e, <= 0.0.0-20260226085519-736f34afb267 | — |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-fm2x-c5qw-4h6fghsaADVISORY
- github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6fnvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-34177ghsaADVISORY
- github.com/canonical/lxd/pull/17909nvdIssue TrackingWEB
News mentions
0No linked articles in our index yet.